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在间歇性洪水下,通过土壤硫酸盐和石灰岩的修改,同时减少大米中的和

Xu Fang¹, Andrea E Colina Blanco², Iso Christl¹

¹Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, CHN, ETH Zurich, CH-8092, Zurich, Switzerland.

Environmental pollution (Barking, Essex : 1987)

|March 14, 2024

概括

结合硫酸盐修改,石灰和间歇性洪水,有效地减少了在粗质的土中种植的大米中的和. 这种方法通过降低有毒金属积累,提高了大米的安全性.

科学领域:

农业科学农业科学
环境化学环境化学
土壤科学土壤科学

背景情况:

米土壤管理可以减少 (As) 或 (Cd) 在米粒中,但不能同时进行两者.
由于在还原条件下移动性更高,而在氧化条件下Cd的移动性更高.
石灰化会减少Cd的积累,而硫酸盐修正会减少中的As的积累.

研究的目的:

调查硫酸盐和石灰岩在间歇性洪水下修改的联合作用,以同时降低大米中的As和Cd.
探索土壤纹理 (沙土与粘土土) 在间歇性洪水下的低As大米生产中的作用.

主要方法:

使用酸性沙土土壤和粘土土土土壤进行了实验.
处理包括在间歇性洪水下混合硫酸盐和石灰岩的修改.
分析了无机As,二甲基酸盐 (DMA) 和Cd的度.
进行了土壤微生物群落分析 (硫酸盐降解剂的基因丰富性).

主要成果:

石灰在米粒中显著降低了Cd和二甲基酸盐 (DMA) 的积累.
结合硫酸盐和石灰岩在酸性沙泥土中的修改减少了43%的无机酸盐,72%的DMA和68%的Cd.
石灰抑制了硫酸盐还原和As甲基化/硫化,并且在更高的pH值下增加了脱DMA,减少了吸收.
在粘土土土壤中间歇性洪水在土壤空气和水的可用性之间进行了权衡,使As减少复杂化.

结论:

结合硫酸盐修改,石灰和间歇性洪水有效地减少来自粗质地土壤的米粒中的As和Cd.
这种综合方法提高了与同时存在的As和Cd污染有关的水安全性.
细纹土壤可能会在间歇性洪水下,由于土壤空气化和水资源供应权衡,对同时减少As和Cd造成挑战.

关键词:

替代性湿燥和干燥 (AWD) 是一种方法.无质子化无质子化乙二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲基酸二甲酸二甲酸二甲酸二甲酸二甲酸二甲酸二甲酸二甲酸二甲酸二甲酸二甲酸二甲酸二甲酸二甲酸二甲酸食品安全食品安全甲基化甲基化甲基化土壤整治土壤整治土壤整治土壤质地土壤质地质地

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